/// <summary>
/// Resolves types for the specified expression.
/// </summary>
/// <param name="expression">The expression to resolve types for.</param>
/// <returns>Expression with resolved types.</returns>
public QueryExpression Visit(LinqGroupJoinExpression expression)
{
var outer = this.ResolveTypes(expression.Outer);
var inner = this.ResolveTypes(expression.Inner);
var outerType = ValidateSourceIsACollection(outer);
var innerType = ValidateSourceIsACollection(inner);
var outerKeySelector = this.ResolveLambdaTypes(expression.OuterKeySelector, outerType);
var innerKeySelector = this.ResolveLambdaTypes(expression.InnerKeySelector, innerType);
var resultSelector = this.ResolveLambdaTypes(expression.ResultSelector, outerType, innerType.CreateCollectionType());
return(LinqBuilder.GroupJoin(outer, inner, outerKeySelector, innerKeySelector, resultSelector, resultSelector.Body.ExpressionType.CreateCollectionType()));
}